package cn.wolfcode.service.impl;

import cn.wolfcode.domain.Permission;
import cn.wolfcode.mapper.PermissionMapper;
import cn.wolfcode.qo.QueryObject;
import cn.wolfcode.service.IPermissionService;
import cn.wolfcode.util.RequiredPermission;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.lang.reflect.Method;
import java.util.Collection;
import java.util.List;
import java.util.Map;

@Service
@Transactional
public class PermissionServiceImpl implements IPermissionService {
    @Autowired
    private PermissionMapper permissionMapper;

    @Override
    public void delete(Long id) {
        permissionMapper.deleteByPrimaryKey(id);
    }

    @Override
    public void save(Permission permission) {
        permissionMapper.insert(permission);
    }

    @Override
    public Permission selectOne(Long id) {
        return permissionMapper.selectByPrimaryKey(id);
    }

    @Override
    public List<Permission> selectAll() {
        return permissionMapper.selectAll();
    }

    @Override
    public void update(Permission permission) {
        permissionMapper.updateByPrimaryKey(permission);
    }

    @Override
    public PageInfo<Permission> query(QueryObject qo) {
        /*int count = permissionMapper.selectForCount(qo);

        if(count == 0){
            PageResult<Permission> pageResult = new PageResult<>(qo.getCurrentPage(), qo.getPageSize(), 0, Collections.emptyList());
            return pageResult;
        }

        int totalPage = count%qo.getPageSize()== 0
                ? count/qo.getPageSize() : count/qo.getPageSize()+1;

        if(qo.getCurrentPage()>totalPage){
            qo.setCurrentPage(totalPage);
        }*/
        PageHelper.startPage(qo.getCurrentPage(), qo.getPageSize());
        List<Permission> permissions = permissionMapper.selectForList(qo);
        //return new PageResult(qo.getCurrentPage(),qo.getPageSize(),count,permissions);
        return new PageInfo<Permission>(permissions);
    }

    @Autowired
    private ApplicationContext ctx;

    @Override
    public void reload() {
        //查询数据库中已经有的权限表达式
        List<String> permissions = permissionMapper.selectAllExssion();
        //        //需求: 把每个控制器中的贴了权限注解的方法转化为权限数据,并插入到数据库中
        Map<String, Object> map = ctx.getBeansWithAnnotation(Controller.class);
        //1.获取所有的控制器

        Collection<Object> controllers = map.values();
        //2.遍历获取每个控制器中的方法
        for (Object controller : controllers) {
            Class<?> clazz = controller.getClass();
            //3.遍历获取到每个方法
            Method[] methods = clazz.getDeclaredMethods();
            for (Method method : methods) {
                //4.判断是否有贴自定义的注解
                RequiredPermission annotation = method.getAnnotation(RequiredPermission.class);
                if (annotation != null) {
                    //5.从注解中获取权限相关的数据,并封装为权限对象
                    String name = annotation.name();
                    String expression = annotation.expression();
                    if (!permissions.contains(expression)) {
                        Permission permission = new Permission();
                        permission.setName(name);
                        permission.setExpression(expression);
                        permissionMapper.insert(permission);
                    }
                }
            }
        }
    }
}
